Skid-arm for double-cutting band-mills.



No. 699,l20.

E. E. THOMAS.

SKID ARM FOR DOUBLE CUTTING BAND MILLS. (A pplicution filed Aug. 20,1901.

Patented Apr. 29, I902.

(No Model.) 3 SheetsSheet l.

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No. 699,!20. Patented Apr. 29, I902.

E. E. THOMAS.

SKID ARM FOR DOUBLE CUTTING BAND MILLS.

(Application filed Aug. 20, 1901..)

3 Sheets Sheet 2.

(No Model.)

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No. s99,|20. Patented Apr. 29, I902.

E. E. THOMAS..

SKID ABM FOB DOUBLE CUTTING BAND MILLS;

(Application filed Aug. 20, 1901. (No Model.) 3 Sheets-Sheet 3.

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UNITED STATES PATENT OFFICE.

EDWIN E. THOMAS, OF ST. PAUL, MINNESOTA, ASSIGNOR OF ONE-HALF TO UNIONIRON WORKS, OF MINNEAPOLIS, MINNESOTA.

SKID-ARM. FORDOVUBLE-CUTTINVGV BAN D-MILLS,

SPECIFICATION forming part of Letters Patent N0. 699,120, dated April29, 1902.

Application filed August 20, 1901- Serial No. 72,648. (No model.) I

To all whom it incl/y concern:

Be it known thatI, EDwINE. THOMAS, of St. Paul, Ramsey county,Minnesota, have invented certain new and useful Improvements inSkid-Arms for Double-Cutting Band-Mills,

of which the following is a specification.

The invention relates to double-cutting band-mills.

The object of the invention is to provide means that are adapted for usewith the wellknown type of log stop or kicker for skidding or bridgingthe logs over the lumber-con veyer,

which in a double-cutting mill is located between the log deck andcarriage.

A further object is to provide means onto which a log may be rolled fromthe carriage should it be necessary to repair the carriage,

clear away the bark under or around the log,

or for any other purpose. I 7 Other objects of the invention will appearfrom the following detailed description.

The invention consists generallyin providing rocking skid-arms whereonthe logs roll part of this specification, Figure l is a plan view of adouble-cutting band-mill,a carriage, and a portion of a log-deck-with myinvention applied thereto. Fig. 2 is an end view.. Fig. 3 is a side viewof the foot-operated mechanism. Fig. 4 is an edge view of'the same.

Fig. 5 is a planview of the floor-plate for said mechanism, theoperative parts being indicated by dotted lines. ---Figs. 6 and 7 aredetails of the antifriction device for said foot- 5o operated mechanism.

In the drawings, 2 represents a double-cutting band-mill of the ordinarytype, 3 a track, and 4a log-carriage having the usual headblocks 5 andknees 6.

For the sake of clearness of illustration I have omitted the timberscomposing the logdeck, merely indicating the surface of the same by thesimple line.

'7, represents a lumber-conveyer used with a double-cutting mill fortaking away the lumber cut on the backward or return stroke of thecarriage, and said conveyer is located between the deck and theband-mill. An idle roll 7 forming part of the conveyer, is placedbetween the carriage and the deck, which are suitably spaced for thatpurpose. If preferred, the couveyer-belt may be extended back in frontof the deck.

8 is a rock-shaft mounted in timbers 9, beneath the log-deck, andcarrying combined log stops and kickers 10 of the type in general use.The devices are shown in their usual position in Fig. 2 acting as stopsto prevent the logs from rolling off the deck. When the shaft is rocked,the stops will be swung down beneath the deck, and the heel of eachdevice or the kicker portion will be elevated to set the log in motiontoward the carriage.

In the rear of the shaft 8 is a second rockshaft 11, also mounted in thetimbers 9 and provided With rocking skid-arms 12 near each 'endfth'efree ends of said arms extending ac'ross'the space between the deck andthe carriage normally below the level of the convey er. One of saidskid-arms preferably has a backward extension or projection 13, to whichthe mechanism for rocking the skid-arm shaft is'connected. Anindependent arm may be provided on the shaft for this purpose, ifpreferred. 0

' The stops, loaders, and skid-arms are within the control of thesawyer, as is customary in mechanisms of this kind. p

Beneath the rock-shafts is a steam-cylinder 14, supported on atimber-15.---A' correspond- 5 ing cylinder 17 is secured ona timber 18beneath the extension 13, and the piston-rod 19 is connected with saidextension by a rod 20. A similar rod 21 connects the piston-rod 22 ofthe cylinder 14. with one of the log-kickers. The cylinders 14 and 17are provided, respec- .7 tively,with slide-valves 23 and 24,which,with

the cylinders, are of ordinary construction and need no detailedillustration or description. The valves have stems 25 and 20, that areslidable in guides 27 on their respective cylinders and are providedwith coil-springs 28, that normally hold the valves in their closedposition. The valve-stem 26 is connected by a link 29 with one end of alever 30, that is pivotally supported at one side of the center on a bar31. The long arm of the lever 30 is pivotally connected by a forked link32 with a pedal-bar 32, that is vertically movable in guide-arms 32",provided on a hanger 33, which depends from the mill-floor 33'. Thepedal-bar 32 projects above the floor through a plate 3% and is providedwith a foot-pedal 35, within reach of the Sawyer. When the pedal-bar isdepressed, the valve 24: will be opened against the tension of itsspring to allow steam to enter the cylinder 17, rock the shaft 11, andraise the skid-arms above the level of the eonveyer.

The valve-stem 25 is connected by a link 36 with one end of a lever 37,that is also pivotally supported at one side of its center on a bar 38and has its long arm pivotally connected with a bar 39 by means of afork-shaped link connection 40. The bar 38 is movable in the guide-arms32" and has a projection 41 near its upper end in position to be struckby a lug 42 on the bar 32 when it is depressed. The hanger 33 isprovided with a slot a3,within which I arrange an antifriction hearingor guide wheel 4%, mounted in a frame 45. The frame is provided with aslot 46 and is inclosed by a housing 47, having an open outer end. A pin48 passes through said housing and the slot 46 and limits the horizontalmovement of the wheel 44. A second pin 40 is provided in the housingnear its open end, and between said pin 49 and the end of the wheelframeI arrange a coil-spring 50, accessible through the open end of thehousing and normall y holding the an tifriction-wheel forward to act asa guide for the pedal-bar 32 and cause its lug to positively engage theother bar 38. The simultaneous depression of the two bars will thereforetake place when the sawyer places his foot on the pedal, the stop andkicker piston will be operated to actuate the stops and kickers, and theskid-arm shaft will be rocked to raise the arms above thelumberconveyer. The opening in the floorplate through which thepedal-bar projects is sufficiently large to allow lateral movement ofsaid bar, and should the sawyer at any time wish to operate theskid-arms independently of the stops and kickers he can do so bypressing the bar 32' to one side against the wheel 44 and forcing saidwheel back into the housing until the lug 42 clears the projection 41,when the pedal-bar may be depressed, as before, and the stops andkickers will remain inoperative while the skid-arms are elevated. Thisoperation of the skid-arms independently of the stops and kickersenables the millmen to roll a log back off the carriage upon the skidsshould they wish to repair the earriage or clear away the bark withoutreleasing any of the logs on the deck. The mechanism may be readilyattached to a log-deck without changing the construction or affectingthe operation of the ordinary log stops and kickers that may be in use,and is in consequence especiallyadapted for mills already in operation.

The operating parts of the device may of course'be modified, theessential features being its adaptability to mills equipped with thecommon form of stops and kickers and the mechanism which permitssimultaneous operation of the stops, kickers, and skid-arms or theindependent use of the latter.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a double-cutting band-mill, the combination,with a log-deck, of a carriage spaced therefrom, a lumber-conveyer, logstops and kickers, oscillating bridging means extending across said conveyer normally below its level, a single operating-bar Within thecontrol of the sawyer and means governed by the movement of said bar foroperating said stops and kickers and bridging means simultaneously, orsaid bridging means independently of said stops and kickers,substantially as described.

2. In a band-mill, the combination, with the log stops and kickers, ofthe carriage and its track spaced therefrom, alumber-conveyer,oscillating skid-arms, cylinders having their pistons connectedrespectively with said stops and kickers and said skid-arms and providedwith suitable valves, bars adapted to be actuated by the foot of thesawyer, one of said bars being provided with means for operating theother bar and operative connections provided respectively between saidbars and said valves.

3. The combination, with a log-deck, of the carriage spaced therefrom,lumber-conveying rolls provided between said deck and carriage, arock-shaft, arms mounted on said shaft beneath said deck and havingtheir free ends projecting across the space between said deck andcarriage and normally below the level of said rolls, log stops andkickers, cylinders having their pistons connected respectively with saidrock-shaft and said log stops and kickers and provided with suitablevalves, bars adapted to be actuated by the foot of the sawyer, one ofsaid bars being operable by the movement of the other and operativeconnections provided respectively between said bars and saidvalves.

4. In a double-cutting band-mill, the combination, with the log deck, ofa carriage spaced therefrom, a lumber conveyer, 10g stops and kickers, arock-shaft, skid-arms thereon projecting across and normally below thelevel of said conveyor, a pedal-bar and means controlled by the movementof said tively between said bars and said valves, substantially asdescribed.

6. In a double-cutting baud-mill, the combination, withthe-log-deck, ofa carriage and track spaced therefrom, a lumber-conveyer providedbet'ween'said deck and carriage,-

bridging means for said conveyer, a cylinder connected with saidbridging means and having a suitable valve, a pedal-bar having a lug, asecond bar engaged by said lug when said pedal-bar is depressed, asecondcylinder connected with said stops and kickers and also having avalve,and operative connections provided between said bars and saidvalves respectively, substantially as described.

7. In a double-cutting band-mill, the combination, with a log-deck, of'acarriage and track spaced therefrom, a lumber-conveyer between said deckand carriago,log stopsand kickers, skid-arms projecting across saidconveyer and normally below its level, means for operating said stopsand kickers,independent means for operating said arms, a baroperativelyconnected with said stop and kicker operating means, and apedal-bar having means for engaging and actuating said firstnamed barwhen depressechand suitable connections between said pedal-bar and saidskid-arm-operating means, substantially as 7 described.

8. In a double-cutting band-mill, the combination, With-the log-deck, ofa-carriage and track spaced therefrom, alumber-conveyer, oscillating logstops and kickers, skid-arms projecting across said conveyer normallybelow its level, means for operating said stops and kickers, independentmeans for operating said arms, a bar operatively connected with-saidstop and kicker operatingmeans, a pedal-bar having means'for engagingand actuating said first-named bar when depressed,

yielding means for holding and guiding said pedal-bar during itsdepression, and suitable connections provided between said pedal-bar andsaid skid-arm-operat-ing means, substan-.

tially as described. 1

9. In a double-cutting band-mill, the combination, with a log-deck, of acarriage spaced therefrom,lumber-conveying rolls provided between saiddeck and carriage, oscillating skid-arms supported beneath said deck andbridging the space betweenthe same and-said carriage and normallybelowthe level of said. rolls,log stops and kickers nearsaid skid-arms,a pedal-bar, means controlled by the'movement of said bar for operatingsaid skid-arms and said stops and kickers'simult-aneously, and meanspermittingthe movement'of said bar to cause the operation of saidskid-arms I 10. The combination, with a log-deck, of a carriage andtrack spaced therefrom, lu rnberconveying rolls provided between saiddeck and carriage, oscillating skid-arms projecting across thespacebetween. said deokand carriage and normally below thelevel of saidrolls, log stops and kickers provided near said skid-arms, means foroperating said skid arms, means for operating said log stops andkickers, and a single operating device forreleasing with one movementsaid skid-arm and said independently of said stops and kickers,substantially as described.

stop and kicker operating means. to actuate them simultaneously or forreleasing, with a similar movement, saidskid-arm-operating meansindependently of said stop and kicker operating means.

11. The combination, with the log stops and therefrom, a lumberconveyer, oscillating skid-arms, cylinders having their pistonsconnected respectively with said-stops and kick.

ers and said skid-arms and provided with suitable valves, anoperatingdevicewithin reach of the sawyer, a second operating device opkickers,ofa carriage and its track spaced erated by the movement of the first,and suitable connections provided respectively between-said operatingdevices and said-valves. '1

In testimony whereof -I have hereunto set my hand, this 15th 'day ofAugust, 1901, at

Minneapolis, Minnesota. I g

EDWIN'E. THOMAS.

In presence of RICHARD PAUL, M. E. GooLEY.

